JP3711111B2 - Linear motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a linear motor, and more particularly to a structure of a stator or a mover on a side around which a coil is wound.
[0002]
[Prior art]
As shown in FIG. 16, this type of conventional linear motor is formed by attaching a coil 2 to an iron core 1 formed by laminating a large number of comb-like iron plates having slots 1a formed at a predetermined pitch. Although it is composed of a child 3 and a movable member 4 which faces the stator 3 and is movable through a gap, the upper opening of the slot 1a is wide as apparent from the figure. When the traveling magnetic field is generated by this, the traveling magnetic field is amplitude-modulated with a period equal to the pitch, and there is a problem that a force in a direction to cancel the thrust of the linear motor is generated and the output is reduced.
For this reason, as shown in FIG. 17, the stator 3 is formed by laminating a plurality of iron plates provided with protrusions 1b in the upper opening of the slot 1a, and the upper opening of the slot 1a is narrowed by the protrusion 1b. It is also known to deal effectively.
[0003]
However, if the protrusion 1b is provided in the upper opening of the slot 1a in this way, the upper opening of the slot 1a becomes narrow, so that there is a problem that the operation of winding or fitting the coil 2 becomes extremely difficult.
Therefore, for example, in JP-A-6-165469, etc., as shown in FIG. 18, branch portions 5c are formed on both ends of the teeth 5a of the iron core 5 via notches 5b, and the coil 6 is formed in the slot 5d. After winding or fitting, as shown in FIG. 19, it is proposed to bend the notch 5b to narrow the space between the tips of the teeth 5a.
[0004]
[Problems to be solved by the invention]
The conventional linear motor is configured as described above. After winding or fitting the coil 6 in the slot 5d, the notch is bent to narrow the gap between the tips of the teeth 5a. It solves the problem that the fitting operation is relatively easy and the output is reduced.
However, when the coil 6 is wound or fitted, the upper opening of the slot 5d is widened, but it is not wider than the width of the slot 5d. Therefore, when the coil 6 is wound directly, Since it is necessary to secure a path for the winding nozzle (not shown), the winding density of the coil 6 is reduced accordingly, and the coil 6 is enlarged to obtain a predetermined capacity. If the coil 6 is inserted into the slot 5d, it is not necessary to secure a path for the winding nozzle in the slot 5d, so that the winding density can be increased, but the coils 6 are connected. There are problems such as an increase in the number of parts and the work for increasing the cost.
[0005]
The present invention has been made to solve the above-described problems, and provides a linear motor that can be reduced in size and cost by enabling direct winding without lowering the winding density of the coil. It is for the purpose.
[0006]
[Means for Solving the Problems]
A linear motor according to the present invention is applied to one of a stator and a mover, and a laminated yoke member formed by laminating core members formed by arranging a plurality of core pieces having magnetic pole teeth in a strip shape. A coil member wound around the magnetic pole teeth of the laminated yoke member,
The core member is formed by overlapping the first core member and the second core member,
The core piece has a convex end face at one end in the arrangement direction and a concave end face at the other end, and the convex end face of the adjacent core piece of each of the first core member and the second core member, and the above The concave end face is fitted,
The first core member and the second core member are arranged so that the direction of the convex end surface of the first core member is opposite to the direction of the convex end surface of the second core member, and The surface on the convex end face side of the core piece of the first core member and the surface on the convex end face side of the second core member overlap,
A connecting means for connecting the core pieces in the stacking direction to the surface on the convex end face side of the core pieces, wherein the adjacent core pieces can be bent at a fitting portion between the convex end face and the concave end face. It is provided.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
Embodiments of the present invention will be described below with reference to the drawings. 1 is a cross-sectional view showing a configuration of a linear motor according to Embodiment 1 of the present invention, FIG. 2 shows a configuration of connecting means for connecting the core pieces of the laminated yoke member in FIG. 1, (A) is a plan view, (B) is a sectional view showing a section along line AA in (A), FIG. 3 is a plan view showing the configuration of the stator in FIG. 1, and FIG. 4 is a winding method of the stator coil in FIG. FIGS. 5 and 6 are cross-sectional views showing configurations of main parts of the linear motor according to Embodiment 1 of the present invention, which are different from those in FIG.
[0008]
In the figure, reference numeral 7 denotes a plate-like core piece made of a magnetic material. A concave portion 7a and a convex portion 7b as connecting means are formed on the back surface on one end side. A concave end surface 7d that can be fitted to the convex end surface 7c of the adjacent core piece 7 is formed on the other end side, and the magnetic pole teeth 8 are formed outward from the central portion. Are projected. Reference numeral 9 denotes a first core member in which a plurality of core pieces 7 are arranged via respective convex end surfaces 7c and concave end surfaces 7d.
[0009]
Reference numeral 10 denotes a second core member in which the core pieces 7 are alternately arranged in the longitudinal direction with respect to the first core member 9 and constitutes the laminated yoke member 11 together with the first core member 9. As shown in FIG. 2, the first cores are alternately connected to each other so that the concave portions 7 a and the convex portions 7 b of the core pieces 7 adjacent to each other in the laminating direction are fitted together. The side surface of the convex end surface 7c of the member 9 and the convex end surface 7d of the second core member 10 indicated by a broken line overlap each other, and the magnetic resistance is reduced by this overlap. The core piece 7 which is the uppermost layer is formed with a hole portion 7e into which the convex portion 7b can be fitted. Reference numeral 12 denotes a coil wound around each magnetic pole tooth 8 via an insulating bobbin 13, and reference numeral 14 denotes a holding member for holding the laminated yoke member 11 on the fixed side, and these 7 to 14 constitute a stator 15. Reference numeral 16 denotes a mover in which a plurality of permanent magnets 17 are mounted at a predetermined pitch on the side facing the stator 15 and arranged at a predetermined gap, that is, an air gap, from the tip of each magnetic pole tooth 8 of the stator 15. , 18 is a winding machine that winds the coil 12 through a nozzle 19, and 20 is a winding jig that is rotationally driven by a drive shaft 21.
[0010]
Next, the manufacturing method of the linear motor in Embodiment 1 comprised as mentioned above is demonstrated.
First, the first and second core members 9 and 10 are alternately punched by press punching and sequentially stacked in the mold, and the concave portions 7a and the convex portions 7b facing each other in the stacking direction of the core pieces 7 are fitted to each other. At the same time, the laminated yoke member 11 is constructed as shown in FIG. Then, the insulating bobbins 13 are respectively attached to the magnetic pole teeth 8 of the laminated yoke member 11.
[0011]
Next, as shown in FIG. 4, the laminated yoke member 11 is mounted on a winding jig 20 that is rotationally driven by a drive shaft 21. Then, the core pieces 7 mounted on the winding jig 20 are bent by the rotation of the concave portions 7a and the convex portions 7b as connecting means, and the tips of the magnetic pole teeth 8 are radially expanded. Next, in the state where the tips of the magnetic pole teeth 8 are expanded as described above, the winding machine 18 performs winding on the magnetic pole teeth 8 via the nozzles 19 to form the coils 12.
[0012]
Then, the winding jig 20 is driven by the rotation of the drive shaft 21, the next new core pieces 7 are sequentially attached to the winding jig 20, and the winding is performed again to form the coil 12. Thereafter, the same operation is repeated and assembled in a state as shown in FIG. 3, and then each core piece 7 side of the laminated yoke member 11 is held and fixed by the holding member 14 to form the stator 15. A linear motor is completed by disposing the mover 16 on the front end side of the 8 via an air gap.
Then, a thrust is generated in the mover 16 by a traveling magnetic field generated by exciting each coil 12, and the object to be transported mounted on the mover 16 is transported by this thrust.
[0013]
As described above, according to the first embodiment, the concave portions 7a and the convex portions 7b as connecting means are rotated to bend between the core pieces 7 and the magnetic pole teeth 8 are radially expanded so that the windings are wound. Since the coil 12 is formed, there is no need to ensure the passage of the nozzle 19 even when the coil is directly wound, and the winding density can be sufficiently increased. Therefore, the size can be reduced and the cost can be reduced. In addition, since each core piece 7 bent after winding is restored to the normal state, the opening width between the tips of the magnetic pole teeth 8 can be reduced as shown in FIG. As shown in FIG. 6, since the opening width can be eliminated by bringing the tips of the magnetic pole teeth 8 into contact with each other, the movement of the mover 16 can be made smooth.
[0014]
Embodiment 2. FIG.
7 is a cross-sectional view showing the configuration of the stator of the linear motor according to the second embodiment of the present invention, and FIG. 8 shows a configuration different from that shown in FIG. 7 of the stator of the linear motor according to the second embodiment of the present invention. It is sectional drawing.
In the figure, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
[0015]
Reference numeral 22 denotes a plurality of core pieces which are made of a magnetic material and each have a dovetail groove 22a formed on a side corresponding to a holding member which will be described later, and are connected so as to be bendable through thin portions 23 as connecting means. Reference numeral 24 denotes a magnetic pole tee projecting outward from each core piece 22, and reference numeral 25 denotes a core member formed of these 22 to 24. A predetermined number of sheets are stacked and integrated by, for example, staking or the like. A yoke member 26 is configured. The coils 12 are wound around the magnetic pole teeth 24 of the laminated yoke member 26 via the insulating bobbins 13. 27 is a holding member in which a plurality of protrusions 27a that can be fitted to the dovetail groove 22a are formed at positions corresponding to the dovetail grooves 22a of each core piece 22, and by fitting each protrusion 27a with the dovetail groove 22a, The laminated yoke member 26 is held and fixed to constitute a stator 28.
[0016]
As described above, according to the second embodiment, the thin-walled portion 23 as the connecting means is bent so that the core pieces 22 can be bent. Since the coil 12 can be formed by winding the tee 24 in a radially expanded state, the winding density can be sufficiently increased to reduce the size and the cost. The protrusion 27a is fitted into the dovetail groove 22a of the core piece 22 to fix and hold the laminated yoke member 26, so that the mechanical strength can be improved.
[0017]
In the configuration in FIG. 7, the dovetail groove 22 a is formed on the core piece 22 side and the protrusion 27 a is formed on the holding member 27 side. However, as shown in FIG. 8, the protrusion 22 b is formed on the core piece 22 side. It goes without saying that the dovetail grooves 27b may be formed on the holding member 27 side, respectively, and the same effects as described above can be exhibited.
[0018]
Embodiment 3 FIG.
FIG. 9 is a cross-sectional view showing the configuration of the stator of the linear motor according to Embodiment 3 of the present invention.
In the figure, the same parts as those in the second embodiment are denoted by the same reference numerals, and the description thereof is omitted. Reference numeral 29 denotes a holding member formed of a resin such as a thermoplastic resin such as polybutylene terephthalate or a thermosetting resin such as an epoxy resin. This resin is wound around the magnetic pole teeth 24 when the holding member 29 is formed. The coil 12 is embedded in a gap existing in the vicinity of the coil 12, and is molded together with the coil 12 and the laminated yoke member 26.
[0019]
As described above, according to the third embodiment, since the coil 12 and the laminated yoke member 26 are integrally molded with the resin forming the holding member 29, the assembly workability and the mechanical strength can be improved. It becomes possible.
[0020]
Embodiment 4 FIG.
10 is a cross-sectional view showing the configuration of the main part of the stator of the linear motor according to Embodiment 4 of the present invention, FIG. 11 is a rear view showing the configuration of the main part of the stator of the linear motor in FIG. 10, and FIG. It is a top view which shows the arrangement | positioning relationship of the stator and mover of a linear motor in Embodiment 4 of this invention.
In the figure, the same parts as those in the first to third embodiments are denoted by the same reference numerals, and the description thereof is omitted.
[0021]
Reference numeral 30 denotes a plate-like core piece made of a magnetic material, which is provided with a recess 30b that forms a joint shape by being rotatably fitted with a protrusion 30a at one end and the protrusion 30a of the core piece 30 adjacent to the other end. It has been. 31 is a magnetic pole tee formed to protrude outward from each core piece 30, and the coil 12 is wound around the insulating bobbin 13. 32 is a core member formed by connecting a predetermined number of core pieces 30 by fitting each protrusion 30a and recess 30b, and 33 is a predetermined number of the core members 32 stacked, for example by caulking. 11 is a laminated yoke member formed integrally with each other, and as shown in FIG. 11, each core piece 30 is made to be a core member by sliding each fitting portion of each protrusion 30a and recess 30b by a predetermined amount. The stator 34 is configured by sequentially shifting in the stacking direction of 32 and fixedly held by a holding member (not shown).
[0022]
As described above, according to the fourth embodiment, the core pieces 30 are sequentially shifted in the stacking direction of the core members 32 by sliding the fitting portions of the protrusions 30a and the recesses 30b by a predetermined amount. As shown in FIG. 12, for example, as shown in FIG. 12, by placing the stator 34 at a predetermined angle α with respect to the mover 35, it is possible to easily give a skew and to generate cogging. Can be effectively suppressed.
[0023]
Embodiment 5 FIG.
13 is a cross-sectional view showing the configuration of the main part of the stator of the linear motor according to Embodiment 5 of the present invention, FIG. 14 is a rear view showing the configuration of the main part of the stator of the linear motor in FIG. It is a top view which shows the arrangement | positioning relationship of the stator and mover of a linear motor in Embodiment 5 of this invention.
In the figure, the same parts as those in the first to fourth embodiments are denoted by the same reference numerals, and the description thereof is omitted.
[0024]
Reference numeral 36 denotes a plate-like core piece made of a magnetic material and laminated in a predetermined number. The uppermost and lowermost core pieces 36 are connected so as to be bendable through thin portions 36a as connecting means, as shown in FIG. In this way, by bending the thin portions 36a of the upper and lower core pieces 36 in the stacking direction, the core pieces 36 are sequentially shifted in the stacking direction and fixed and held by a holding member (not shown). Thus, the stator 37 is configured.
[0025]
As described above, according to the fifth embodiment, the respective core pieces 36 are sequentially shifted in the stacking direction by bending the thin portions 36a of the uppermost and lowermost core pieces 36 in the stacking direction. Therefore, for example, as shown in FIG. 15, the skew can be easily given by arranging the stator 37 at a predetermined angle α with respect to the mover 35 as in the fourth embodiment. And the occurrence of cogging can be effectively suppressed.
[0026]
In each of the first to fifth embodiments, the configuration in which the winding is provided on the stator side has been described. However, the configuration is not limited to this, and the configuration in which the winding is provided on the mover side is described. It goes without saying that even if applied to the above, the same effects as described above can be exhibited.
[0027]
【The invention's effect】
As described above, according to the linear motor according to the present invention, the core member is applied to one of the stator and the mover, and is formed by stacking the core members formed by arranging a plurality of core pieces having magnetic pole teeth. A laminated yoke member, and a coil member wound around the magnetic pole teeth of the laminated yoke member,
The core member is formed by overlapping the first core member and the second core member,
The core piece has a convex end face at one end in the arrangement direction and a concave end face at the other end, and the convex end face of the adjacent core piece of each of the first core member and the second core member, and the above The concave end face is fitted,
The first core member and the second core member are arranged such that the direction of the convex end surface of the first core member is opposite to the direction of the convex end surface of the second core member, and The surface on the convex end face side of the core piece of the first core member and the surface on the convex end face side of the second core member overlap,
A connecting means for connecting the core pieces in the stacking direction to the surface on the convex end face side of the core pieces, wherein the adjacent core pieces can be bent at a fitting portion between the convex end face and the concave end face. Therefore, it is possible to provide a linear motor that can be reduced in size and reduced in cost by enabling direct winding without reducing the winding density of the coil, and between the arranged core pieces. Magnetic resistance can be reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a configuration of a linear motor according to Embodiment 1 of the present invention.
2 shows a configuration of a connecting means for connecting the core pieces of the laminated yoke member in FIG. 1, (A) is a plan view, and (B) is a cross section showing a cross section along line AA in (A). FIG.
FIG. 3 is a plan view showing a configuration of a stator in FIG. 1;
4 is a diagram for explaining a winding method of a stator coil in FIG. 3; FIG.
FIG. 5 is a cross-sectional view showing a configuration different from that shown in FIG. 1 of the main part of the linear motor according to Embodiment 1 of the present invention.
FIG. 6 is a cross-sectional view showing a further different configuration from that shown in FIG. 1 of the main part of the linear motor according to the first embodiment of the present invention.
FIG. 7 is a cross sectional view showing a configuration of a stator of a linear motor according to Embodiment 2 of the present invention.
FIG. 8 is a cross-sectional view showing a configuration different from that shown in FIG. 7 of the stator of the linear motor according to the second embodiment of the present invention.
FIG. 9 is a sectional view showing a configuration of a stator of a linear motor according to Embodiment 3 of the present invention.
FIG. 10 is a cross-sectional view showing a configuration of a main part of a stator of a linear motor according to Embodiment 4 of the present invention.
11 is a rear view showing the configuration of the main part of the stator of the linear motor in FIG.
FIG. 12 is a plan view showing the positional relationship between a stator and a mover of a linear motor according to Embodiment 4 of the present invention.
FIG. 13 is a cross sectional view showing a configuration of a main part of a stator of a linear motor according to a fifth embodiment of the present invention.
14 is a rear view showing the configuration of the main part of the stator of the linear motor in FIG. 13. FIG.
FIG. 15 is a plan view showing a positional relationship between a stator and a mover of a linear motor according to Embodiment 5 of the present invention.
FIG. 16 is a cross-sectional view showing a configuration of a conventional linear motor.
FIG. 17 is a plan view showing a configuration different from that shown in FIG. 16 of the iron core of the stator of the conventional linear motor.
18 is a plan view showing a further different configuration from that shown in FIG. 16 of the iron core of the stator of the conventional linear motor.
19 is a cross-sectional view showing a configuration of a linear motor using the stator iron core shown in FIG. 18;
[Explanation of symbols]
7, 22, 30, 36 core piece, 7a concave portion, 7b convex portion,
7c Convex end face, 7d Concave end face, 22a, 27b Dovetail groove,
22b, 27a protrusion, 30a protrusion, 30b recess, 36a thin-walled part,
8, 24, 31 magnetic pole teeth, 9 first core member, 10 second core member,
11, 26, 33 Laminated yoke members, 12 coils, 13 insulating bobbins,
14, 27, 29 holding member, 15, 28, 34, 37 stator,
16, 35 mover, 18 winding machine, 19 nozzle, 20 winding jig,
23, 36a Thin portion, 25, 32 core member.

Claims (2)

A laminated yoke member that is applied to one of the stator and the movable element and is formed by laminating a core member in which a plurality of core pieces having magnetic pole teeth are arranged in a strip shape, and the magnetic pole of the laminated yoke member A coil member wound around the tee,
The core member is formed by overlapping the first core member and the second core member,
The core piece has a convex end face at one end in the arrangement direction and a concave end face at the other end, and the convex end face of the adjacent core piece of each of the first core member and the second core member, and the above The concave end face is fitted,
The first core member and the second core member are arranged so that the direction of the convex end surface of the first core member is opposite to the direction of the convex end surface of the second core member, and The surface on the convex end face side of the core piece of the first core member and the surface on the convex end face side of the second core member overlap,
A connecting means for connecting the core pieces in the stacking direction to the surface on the convex end face side of the core pieces, wherein the adjacent core pieces can be bent at a fitting portion between the convex end face and the concave end face. A linear motor characterized by being provided. 2. The linear motor according to claim 1, wherein a dovetail groove or a protrusion that can be fitted into the dovetail groove is formed on a side of the core member different from the magnetic pole teeth.

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